spring OriginLookup 源码
springboot OriginLookup 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/origin/OriginLookup.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.origin;
/**
* An interface that may be implemented by an object that can lookup {@link Origin}
* information from a given key. Can be used to add origin support to existing classes.
*
* @param <K> the lookup key type
* @author Phillip Webb
* @since 2.0.0
*/
@FunctionalInterface
public interface OriginLookup<K> {
/**
* Return the origin of the given key or {@code null} if the origin cannot be
* determined.
* @param key the key to lookup
* @return the origin of the key or {@code null}
*/
Origin getOrigin(K key);
/**
* Return {@code true} if this lookup is immutable and has contents that will never
* change.
* @return if the lookup is immutable
* @since 2.2.0
*/
default boolean isImmutable() {
return false;
}
/**
* Return the implicit prefix that is applied when performing a lookup or {@code null}
* if no prefix is used. Prefixes can be used to disambiguate keys that would
* otherwise clash. For example, if multiple applications are running on the same
* machine a different prefix can be set on each application to ensure that different
* environment variables are used.
* @return the prefix applied by the lookup class or {@code null}.
* @since 2.5.0
*/
default String getPrefix() {
return null;
}
/**
* Attempt to look up the origin from the given source. If the source is not a
* {@link OriginLookup} or if an exception occurs during lookup then {@code null} is
* returned.
* @param source the source object
* @param key the key to lookup
* @param <K> the key type
* @return an {@link Origin} or {@code null}
*/
@SuppressWarnings("unchecked")
static <K> Origin getOrigin(Object source, K key) {
if (!(source instanceof OriginLookup)) {
return null;
}
try {
return ((OriginLookup<K>) source).getOrigin(key);
}
catch (Throwable ex) {
return null;
}
}
}
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- 所属分类： 后端技术
- 本文标签： Spring Boot Java Spring
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